Abivax S.A.

We have adopted a Code of Business Conduct and Ethics, applicable to all of our employees, senior

management and directors, which is available on our website at www.abivax.com. We intend to promptly disclose

(i) the nature of any amendment (other than technical, administrative or other non-substantive amendments) to the

Code of Business Conduct and Ethics that applies to our principal executive officer, principal financial officer,

principal accounting officer or controller, or persons performing similar functions, and relates to any element of the

code of ethics definition enumerated in Item 16B(b) of Form 20-F and (ii) the nature of any waiver, including an

implicit waiver, from a provision of the Code of Business Conduct and Ethics that is granted to one of these

specified individuals that relates to one or more of the elements of the code of ethics definition enumerated in Item

16B(b) of Form 20-F, the name of such person who is granted the waiver and the date of the waiver. The reference

to our website address does not constitute incorporation by reference of the information contained at or available

through our website, and you should not consider it to be a part of this Annual Report.

Item 16C. Principal Accountant Fees and Ser